Is it possible to extract a single value from the results of a LINQ query
with out iterating over the results.

For example I have a table in SQL Server:

tblExample
Type int <--this is a key field
Descr nvarchar(5)

I would like to get the description (Descr) field something like this in C#:

string Description = from Example in db.tblExample where Example.Type = 1
select Example.Descr;

I know this query returns an IQueryable and the above query won't compile
because of type mismatch. Is there a way to get the string from the database
field using a LINQ query?

Try :

string Description = (from Example in db.tblExample where Example.Type = 1
select Example.Descr).Single;

Single raise an exception if it does't return exactly a single record...

--
Patrice

"SftwDude" <SftwDude@nospam.nospam> a écrit dans le message de news:
C564C712-584B-4E60-A702-991DBA7CB303@microsoft.com...
[quoted text, click to view]

Thanks for Patrice's prompt reply.

Hello SftwDude

I agree with Patrice. Single () function returns only one element from
query, and throws an exception if sequence contains more than one element
or empty. Alternative way, you can use First() function to return the
first element from the query when there are more than one element in your
sequence.
For example:

string Description = (from Example in db.tblExample
where Example.Type = 1
select Example.Descr).Frist();

Hope this helps, If you have any more concern or there is anything unclear,
please feel free to let us know. We are glad to assist you.

Have a great day,
Best regards,
Wen Yuan

Microsoft Online Community Support
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